Create STRUCT object array with data

// Cloud Spanner STRUCT<> types with named fields are represented by
// std::tuple<std::pair<std::string, T>...>, create an alias to make it easier
// to follow this code.
usingSingerName=std::tuple<std::pair<std::string,std::string>,
std::pair<std::string,std::string>>;
automake_name=[](std::stringfirst_name,std::stringlast_name){
returnstd::make_tuple(std::make_pair("FirstName",std::move(first_name)),
std::make_pair("LastName",std::move(last_name)));
};
std::vector<SingerName>singer_info{
make_name("Elena","Campbell"),
make_name("Gabriel","Wright"),
make_name("Benjamin","Martinez"),
};

varbandMembers=newList<SpannerStruct>
{
newSpannerStruct{{"FirstName",SpannerDbType.String,"Elena"},{"LastName",SpannerDbType.String,"Campbell"}},
newSpannerStruct{{"FirstName",SpannerDbType.String,"Gabriel"},{"LastName",SpannerDbType.String,"Wright"}},
newSpannerStruct{{"FirstName",SpannerDbType.String,"Benjamin"},{"LastName",SpannerDbType.String,"Martinez"}},
};

varbandMembers=[]nameType{
{"Elena","Campbell"},
{"Gabriel","Wright"},
{"Benjamin","Martinez"},
}

List<Struct>bandMembers=newArrayList<>();
bandMembers.add(
Struct.newBuilder().set("FirstName").to("Elena").set("LastName").to("Campbell").build());
bandMembers.add(
Struct.newBuilder().set("FirstName").to("Gabriel").set("LastName").to("Wright").build());
bandMembers.add(
Struct.newBuilder().set("FirstName").to("Benjamin").set("LastName").to("Martinez").build());

constbandMembersType={
type:'array',
child:nameType,
};
constbandMembers=[
Spanner.struct({
FirstName:'Elena',
LastName:'Campbell',
}),
Spanner.struct({
FirstName:'Gabriel',
LastName:'Wright',
}),
Spanner.struct({
FirstName:'Benjamin',
LastName:'Martinez',
}),
];

$bandMembers = [
 (new StructValue)
 ->add('FirstName', 'Elena')
 ->add('LastName', 'Campbell'),
 (new StructValue)
 ->add('FirstName', 'Gabriel')
 ->add('LastName', 'Wright'),
 (new StructValue)
 ->add('FirstName', 'Benjamin')
 ->add('LastName', 'Martinez')
];

band_members = [
 ("Elena", "Campbell"),
 ("Gabriel", "Wright"),
 ("Benjamin", "Martinez"),
]

band_members=[name_type.struct(["Elena","Campbell"]),
name_type.struct(["Gabriel","Wright"]),
name_type.struct(["Benjamin","Martinez"])]